This morning, that included tweeting out an image that looks an awful lot like an album cover, featuring what appears to be a red ticket on a yellow background with his name and the letters "N.B.P." on it.

If McCartney is about to release a new album - and if you still feel like speculating, tomorrow (June 18) is his birthday - it would be his first collection of new material since New, in 2013.

McCartney had been hinting at at releasing new music this year, mentioning on his website in January that he was “putting the finishing touches” on a new album.

Interest was once again piqued earlier this week when McCartney was announced to appear on CBS's The Late Late Show this week, singing with host James Corden and showing him Beatles-related landmarks in Liverpool, U.K., as part of the popular "Carpool Karaoke" segment.

Footage eventually emerged of the Fab One debuting a brand new song called "Come Home to You" during a recent surprise show at a small pub in Liverpool. "This hasn't been released yet. ... It's the first time we played it for anybody," McCartney says before he and his band count into the appealingly choppy rocker.

McCartney also tweeted dailyphotos from a recording studio, theoretically taken during recording sessions for the new album. He also tweeted a curious drawing, which turns up on either side of the "ticket" on this new image.